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Fish could explain how we developed arms, legs
Thursday August 09, 2012 08:59:58 AM,
IANS
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London: The American
paddlefish, one of the oldest fish on the planet, could explain
why we developed our arms and legs, according to scientists.
Researchers have found that the fish duplicated its entire genome
about 42 million years ago.
To study how human limbs develop, scientists compared the
limb-building genes found in mice with fin-building genes in
fishes, the Daily Mail reported Wednesday.
Previous research on paddlefish suggested that fishes possessed
the genetic toolkit required to grow limbs long before the
evolution of the four-limbed creatures (tetrapods) that developed
into reptiles, birds, amphibians and mammals.
"We found that paddlefish have had their own genome duplication,"
said Karen Crow, assistant professor of biology at San Francisco
State University.
"This creates extra genetic material that adds complexity to
comparative studies. It may change the way we interpret studies on
limb development."
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